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19 tháng 2 2019

=>6/-105=10/7x

=>6*7x=-105*10

=>42x=-1050

=>x=-25

Vậy x=-25

8 tháng 1 2020

a) \(-65-\left(x+15\right)+105=0\)

\(-65-\left(x+15\right)=-105\)

\(x+15=-65-\left(-105\right)\)

\(x+15=40\)

\(x=25\)

b) |-6| + (-9) - (x+1) = 7

-3- (x+1) =7

       x+1  = -10

       x      = -11

c)\(\left|5-x\right|+\left(-25+7\right)=-3-\left(-10\right)\)

    \(\left|5-x\right|+\left(-18\right)=7\)

    \(\left|5-x\right|=25\)

\(\Rightarrow\orbr{\begin{cases}5-x=25\\5-x=-25\end{cases}\Rightarrow\orbr{\begin{cases}x=-20\\x=30\end{cases}}}\)

d) \(28-\left|x+6\right|+\left(-2\right)=0\)

\(28-\left|x+6\right|=2\)

\(\left|x+6\right|=26\)

\(\Rightarrow\orbr{\begin{cases}x+6=26\\x+6=-26\end{cases}\Rightarrow\orbr{\begin{cases}x=20\\x=-32\end{cases}}}\)

e) \(x-\left(13-15\right)=5+\left(10-x\right)-\left(-1\right)\)

\(x+2=5+10-x+1\)

\(x+2=16-x\)

\(x+x=16-2\)

\(2x=14\)

\(x=7\)

f) \(-120-\left(x-5\right)=125\)

\(x-5=-120-125\)

\(x-5=-245\)

\(x=-240\)

g) \(10-\left(-5+2\right)+\left(-9\right)=\left(-20+7\right)-x\)

\(-16=-13-x\)

\(x=-13+16\)

\(x=3\)

22 tháng 11 2016

[(7x-63):3-105].6=480

(7x-63):3-105      =480 :6

(7x-63):3-105       =80

(7x-63):3              =80+105

(7x-63):3             =185

7x-63                  =185.3

7x-63                 =555

7x                     =555+63                                                      

7x                     =618

x                      =618:7

x                      =618/7

=>x=618/7

25 tháng 10 2021

\(1,\Leftrightarrow7x=42\Leftrightarrow x=6\\ 2,\Leftrightarrow36-4x=4\Leftrightarrow4x=32\Leftrightarrow x=8\\ 3,\Leftrightarrow3x=35\Leftrightarrow x=\dfrac{35}{3}\\ 4,\Leftrightarrow x-12=144\Leftrightarrow x=156\\ 5,\Leftrightarrow x-14=16\Leftrightarrow x=30\\ 6,\Leftrightarrow3x-24=\dfrac{148}{73}\Leftrightarrow3x=\dfrac{1900}{73}\Leftrightarrow x=\dfrac{1900}{219}\\ 7,\Leftrightarrow33+x=45\Leftrightarrow x=12\\ 8,Sai.đề\\ 9,\Leftrightarrow\left(x+9\right):2=39\Leftrightarrow x+9=78\Leftrightarrow x=69\\ 11,\Leftrightarrow2\left(x+7\right)=38\Leftrightarrow x+7=19\Leftrightarrow x=12\\ 13,\Leftrightarrow2\left(x-51\right)=66\Leftrightarrow x-51=33\Leftrightarrow x=84\)

25 tháng 10 2021

\(15,\Leftrightarrow x-19=9\Leftrightarrow x=28\\ 17,\Leftrightarrow\left(x-3\right):2=48\Leftrightarrow x-3=96\Leftrightarrow x=99\\ 19,\Leftrightarrow0x=46\Leftrightarrow x\in\varnothing\\ 8,Sai.đề\\ 14,\Leftrightarrow2x=209\Leftrightarrow x=\dfrac{209}{2}\\ 16,\Leftrightarrow2x+6=157\Leftrightarrow2x=151\Leftrightarrow x=\dfrac{151}{2}\\ 18,\Leftrightarrow5\left(x+4\right)=100\Leftrightarrow x+4=20\Leftrightarrow x=16\\ 20,\Leftrightarrow\left(3x-5\right)^3=27=3^3\Leftrightarrow3x-5=3\Leftrightarrow x=\dfrac{8}{3}\)

a,\(3\left(\frac{1}{2}-x\right)+\frac{1}{3}=\frac{7}{6}-x\)

\(\Rightarrow\frac{3}{2}-3x+\frac{1}{3}=\frac{7}{6}-x\)

\(\Rightarrow\frac{7}{6}-x+3x=\frac{3}{2}+\frac{1}{3}\)

\(\Rightarrow\frac{7}{6}+2x=\frac{11}{6}\)

\(\Rightarrow2x=\frac{11}{6}-\frac{7}{6}\)

\(\Rightarrow2x=\frac{4}{6}=\frac{2}{3}\)

\(\Rightarrow x=\frac{2}{3}\div2\)

\(\Rightarrow x=\frac{1}{3}\)

Vậy \(x=\frac{1}{3}\)

Hok tốt !!!!!!!!!!!

12 tháng 2 2020

a) -2. (x+ 6) + 6. (x - 10) =8

<=> -2x - 12 + 6x - 60 = 8

<=> 4x = 36

<=> x   = 9

b) -4. (2x + 9) - (-8x + 3) - (x + 13) = 0

<=> -8x - 36 + 8x - 3 - x - 13 = 0

<=> x = 52

c) 7x. (2 + x) - 7x. (x + 3) = 14

<=> 14x + 7x2 - 7x2 - 21x = 14

<=> -7x = 14

<=>  x   =  -2

24 tháng 1 2017

1) 9 . (x + 7) - 12 = 24

9 . (x + 7) = 24 + 12

9 . (x + 7) = 36

x + 7 = 36 : 9

x + 7 = 4

x = 4 - 7

x = -3

2) 12 - 3x = -30

3x = 12 - (-30)

3x = 12 + 30

3x = 42

x = 42 : 3

x = 14

3) 95 - 105 : x = 60

105 : x = 95 - 60

105 : x = 35

x = 105 : 35

x = 3

4) x + 35 = 12

x = 12 - 35

x = -23

5) (-24) - (10 - x) = 43

-24 - 10 + x = 43

-34 + x = 43

x = 43 - (-34)

x = 43 + 34

x = 77

6) 6 - (17 + x) = -16

6 - 17 - x = -16

-11 - x = -16

x = -11 - (-16)

x = -11 + 16

x = 5

7) (x - 18) - (-3) = 0

x - 18 + 3 = 0

x - 18 = 0 - 3

x - 18 = -3

x = -3 + 18

x = 15

8) 25 - (x - 6) = -1

25 - x + 6 = -1

25 - x = -1 - 6

25 - x = -7

x = 25 - (-7)

x = 25 + 7

x = 32

24 tháng 1 2017

1)9.(x+7)-12=24

9.(x+7)=24+12

9.(x+7)=36

x+7=36:9

x+7=4

x=4-7

x=-3